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Table 2 Proposed skin testing concentrations

From: The complexities of insulin allergy: a case and approach

Component Recommended dilution
SPT Intradermal
Insulin No dilution 1/100000–1/10 dilution, then 1/1
Expedient (protamine, metacresol, zinc) Vary depending on concentrations in insulin solutions. Attempt to dilute according to these concentrations 1/1000–1/10 dilution